1211212200111 has 8 divisors (see below), whose sum is σ = 1616202475440. Its totient is φ = 806848362432.

The previous prime is 1211212200103. The next prime is 1211212200113. The reversal of 1211212200111 is 1110022121121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211212200111 - 2³ = 1211212200103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212200113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156604900 + ... + 156612633.

It is an arithmetic number, because the mean of its divisors is an integer number (202025309430).

Almost surely, 2^{1211212200111} is an apocalyptic number.

1211212200111 is a deficient number, since it is larger than the sum of its proper divisors (404990275329).

1211212200111 is a wasteful number, since it uses less digits than its factorization.

1211212200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313218825.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211212200111 its reverse (1110022121121), we get a palindrome (2321234321232).

It can be divided in two parts, 121121 and 2200111, that added together give a palindrome (2321232).

The spelling of 1211212200111 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred thousand, one hundred eleven".